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printscreen读取位图转为jpeg格式输出‖

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.*;

import com.sun.image.codec.jpeg.*;

import java.awt.Image;

import java.awt.Toolkit;

import java.awt.image.BufferedImage;

import java.awt.imag

e.MemoryImageSource;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import com.sun.image

.codec.jpeg.JPEGCodec;

import com.sun.image

.codec.jpeg.JPEGImageEncoder

;

public class ScreenPicSaver

{

MediaTracker tracker = new Med

iaTracker(new Component()

{});

public ScreenPicSaver()

{}

public Image loadbitmap(String

sdir, String sfile) //读取8位或24位的位图文件

{

Image image;

System.out.print

ln("loading:" + sdir + sfile

);

try

{

FileInputStream fs = new F

ileInputStream(sdir + sfile);

int bflen = 14

; // 14 字节 BITMAPFILEHEADE

R

byte bf[] = new byte[bflen];

fs.read(bf, 0, bflen);

int bilen = 40

; // 40 字节 BITMAPINFOHEADE

R

byte bi[] = new byte[bilen];

fs.read(bi, 0, bilen);

// 解释数据。

int nsize = (

( (int) bf[5] & 0xff) < &

lt;　24)

| ( ( (int) bf[4] & 0x

ff) < <　16)

| ( ( (int) bf[3] & 0x

ff) < <　8)

| (int) bf[2] & 0xff;

System.out.pri

ntln("File type is :" + (cha

r) bf[0] + (char) bf[1]);

System.out.pri

ntln("Size of file is :" + n

size);

int nbisize = ( ( (int) bi

[3] & 0xff) < <　24)

| ( ( (int

) bi[2] & 0xff) < <　1

6)

| ( ( (int

) bi[1] & 0xff) < <　8

)

| (int) bi[0] & 0xff;

System.out.println("Size o

f bitmapinfoheader is :" + nbisize);

int nwidth = (

( (int) bi[7] & 0xff) <

<　24)

| ( ( (int) bi[6] & 0x

ff) < <　16)

| ( ( (int

) bi[5] & 0xff) < <　8

)

| (int) bi[4] & 0xff;

System.out.pri

ntln("Width is :" + nwidth);

int nheight = ( ( (int) bi

[11] & 0xff) < <　24)

| ( ( (int

) bi[10] & 0xff) < <

16)

| ( ( (int) bi[9] & 0x

ff) < <　8)

| (int) bi[8] & 0xff;

System.out.println("Height

is :" + nheight);

int nplanes = 0xff;

( ( (int) bi[13] & 0xff) <

; <　8) | (int) bi[12] &

System.out.pri

ntln("Planes is :" + nplanes

);

int nbitcount = ( ( (int) 0xff;

bi[15] & 0xff) < <　8) | (int) bi[14] &

System.out.println("BitCou

nt is :" + nbitcount);

// 查找表明压缩的非零值

int ncompressi

on = ( ( (int) bi[19]) <

<　24)

| ( ( (int) bi[18]) < <　16)

| ( ( (int) bi[17]) < <　8)

| (int) bi[16];

System.out.pri

ntln("Compression is :" + nc

ompression);

int nsizeimage

= ( ( (int) bi[23] & 0xff)

< <　24)

| ( ( (int

) bi[22] & 0xff) < <

16)

| ( ( (int

) bi[21] & 0xff) < <

8)

| (int) bi[20] & 0xff;

System.out.println("SizeIm

age is :" + nsizeimage);

int nxpm = ( (

(int) bi[27] & 0xff) < &

lt;　24)

| ( ( (int

) bi[26] & 0xff) < <

16)

| ( ( (int) bi[25] & 0

xff) < <　8)

| (int) bi[24] & 0xff;

System.out.pri

ntln("X-Pixels per meter is

:" + nxpm);

int nypm = ( ( (int) bi[31

] & 0xff) < <　24)

| ( ( (int

) bi[30] & 0xff) < <

16)

| ( ( (int

) bi[29] & 0xff) < <

8)

| (int) bi[28] & 0xff;

System.out.println("Y-Pixe

ls per meter is :" + nypm);

int nclrused =

( ( (int) bi[35] & 0xff) &l

t; <　24)

| ( ( (int) bi[34] & 0

xff) < <　16)

| ( ( (int) bi[33] & 0

xff) < <　8)

| (int) bi[32] & 0xff;

System.out.pri

ntln("Colors used are :" + n

clrused);

int nclrimp = ( ( (int) bi

[39] & 0xff) < <　24)

| ( ( (int) bi[38] & 0

xff) < <　16)

| ( ( (int) bi[37] & 0

xff) < <　8)

| (int) bi[36] & 0xff;

System.out.println("Colors

important are :" + nclrimp);

if (nbitcount == 24)

{

// 24 位格式不包含调色板数据，但扫描行被补足到

// 4 个字节。

int npad = (nsizeimage /

nheight) - nwidth * 3;

int ndata[]

= new int[nheight * nwidth];

byte brgb[]

= new byte[ (nwidth + npad)

* 3 * nheight];

fs.read(brgb, 0, (nwidth

+ npad) * 3 * nheight);

int nindex = 0;

for (int j = 0; j <

nheight; j++)

{

for (int i = 0; i <

nwidth; i++)

{

ndata[nwidth * (nhei

ght - j - 1) + i] =

(255 & 0xff) < <　24

| (

( (int) brgb[nindex + 2] & 0

xff) < <　16)

| ( ( (int) brgb

[nindex + 1] & 0xff) < <　8)

| (int) brgb[nindex] & 0xff;

/**　 System.out.pri

ntln("Encoded Color at ("

+i +

"," + j + ")is:" + nrgb + "

(R,G,B)= ("

+ ( (int) (br

gb[2]) & 0xff) + ","

+

( (int) brgb[1] & 0xff) + "

,"

+ ( (int) brg

b[0] & 0xff) + ")");

}*/

nindex += 3;

}

nindex += npad;

}

image = Toolkit.getDefau

ltToolkit().createImage

(new Mem

oryImageSource(nwidth, nheig

ht,

ndata, 0, nwidth));

}

else if (nbitcount == 8)

{

// 必须确定颜色数。如果 clrsused 参数大于 0，

// 则颜色数由它决定。如果它等于 0，则根据

// bitsperpixel 计算颜色数。

int nNumColors = 0;

if (nclrused > 0)

{

nNumColors = nclrused;

}

else

{

nNumColors = (1 & 0xff

) < <　nbitcount;

}

System.out.println("The

number of Colors is" + nNumColors);

// 某些位图不计算 sizeimage 域，请找出

// 这些情况并对它们进行修正。

if (nsizeimage == 0)

{

nsizeimage = ( ( ( (nwidth * nbitcount) + 31) & ~31) >> 3);

nsizeimage *= nheight;

System.out

.println("nsizeimage (backup

) is" + nsizeimage);

}

// 读取调色板颜色。

int npalette[] = new int

[nNumColors];

byte bpalett

e[] = new byte[nNumColors *

4];

fs.read(bpalette, 0, nNu

mColors * 4);

int nindex8 = 0;

for (int n = 0; n <

nNumColors; n++)

{

npalette[n

] = (255 & 0xff) < <

24

| ( (

(int) bpalette[nindex8 + 2]

& 0xff) < <　16)

| ( (

(int) bpalette[nindex8 + 1]

& 0xff) < <　8)

| (int) bpalette[n

index8] & 0xff;

/**System.out.println

("Palette Color "+n

+" is:" + npalette[n] + " (

res,R,G,B)= ("

+ ( (i

nt) (bpalette[nindex8 + 3])

& 0xff) + ","

+ ( (i

nt) (bpalette[nindex8 + 2])

& 0xff) + ","

+ ( (i

nt) bpalette[nindex8 + 1] &

0xff) + ","

+ ( (int) bpalette

[nindex8] & 0xff) + ")");

*/

nindex8 += 4;

}

// 读取图像数据（实际上是调色板的索引）

// 扫描行仍被补足到 4 个字节。

int npad8 =

(nsizeimage / nheight) - nwi

dth;

System.out.p

rintln("nPad is:" + npad8);

int ndata8[] = new int[n

width * nheight];

byte bdata[]

= new byte[ (nwidth + npad8

) * nheight];

fs.read(bdat

a, 0, (nwidth + npad8) * nhe

ight);

nindex8 = 0;

for (int j8

= 0; j8 <　nheight; j8++)

{

for (int i8 = 0; i8 &l

t;　nwidth; i8++)

{

ndata8[nwidth * (nhe

ight - j8 - 1) + i8] =

npalette[ ( (int

) bdata[nindex8] & 0xff)];

nindex8++;

}

nindex8 += npad8;

}

image = Toolkit.getDefau

ltToolkit().createImage

(new MemoryImageSour

ce(nwidth, nheight,

ndata8, 0, nwidth));

}

else

{

System.out.println("Not aborting...");

a 24-bit or 8-bit Windows Bitmap,

image = (Image)null;

}

fs.close();

return image;

}

catch (Exception e)

{

System.out.pri

ntln("Caught exception in lo

adbitmap!");

}

return (Image)null;

}

public void waitForImage(Image image)

{

//tracker = new MediaTracker(this);

try

{

tracker.addImage(image, 0)

; //public void addImage(Image image,int id)

//tracker.waitForAll();

tracker.waitForID(0);

tracker.checkAll(true);

/** while(!tracker.checkID(0))

{

tracker.waitForID(0);

}*/

if (tracker.isErrorAny())

{

// System.out.println(tr

acker.getErrorsAny().toString());

System.out.println("加载图像出现错误！");

System.exit(0);

}

// loadStatus = tracker.st

atusID( 0, false );

// tracker.removeImage(image, 0);

}

catch (InterruptedException e)

{

e.printStackTrace();

}

} // waitForImage

public void checkImage(Image image)

{

waitForImage(image);

int imageWidth = image.getWi

dth(null);

if (imageWidth <　1)

{

throw new IllegalArgumentE

xception("image width " + imageWidth +

" is out of range");

}

int imageHeight = image.getH

eight(null);

if (imageHeight <　1)

{

throw new Ille

galArgumentException("image

height " + imageHeight +

" is ou

t of range");

}

// System.out.println( "Imag

e size=" + imageWidth + "x" + imageHeight );

} // checkImage

public void encode

JPEG(OutputStream outputStre

am, Image outputImage,

float outputQuality) th

rows java.io.IOException

{

int outputWidth

= outputImage.getWidth(null)

;

if (outputWidth <　1)

{

throw new IllegalArgumentE

xception("output image width " + outputWidth +

" is out of range");

}

int outputHeight

= outputImage.getHeight(nul

l);

if (outputHeight <　1)

{

throw new IllegalArgumentE outputHeight +

xception("output image height " +

?br>

" is ou

t of range");

}

// Get a buffere

d image from the image.

BufferedImage bi

= new BufferedImage(outputW

idth, outputHeight,

BufferedImage.TYPE_INT_RGB);

Graphics2D biContext = bi.cr

eateGraphics();

biContext.drawImage(outputIm

age, 0, 0, null);

// Note that additional draw here.

ing such as watermarks or logos can be placed

// com.sun.image.codec.jpeg

package is included in sun and ibm sdk 1.3

JPEGImageEncoder encoder = J

PEGCodec.createJPEGEncoder(outputStream);

// The default quality is 0.75.

JPEGEncodeParam jep = JPEGCo

dec.getDefaultJPEGEncodeParam(bi);

jep.setQuality(outputQuality, true);

encoder.encode(bi, jep);

// encoder.encode( bi );

outputStream.flush();

} // encodeImage

/** Adjusts the si

ze of the image to the given

coordinates.

* If width or hei

ght is -1, the image aspect

ration is maintained.

* < p>

* Hints are one o

f SCALE_DEFAULT, SCALE_FAST,

SCALE_SMOOTH,

* SCALE_REPLICATE

, SCALE_AREA_AVERAGING as de

fined in java.awt.Image.

*/

public Image setSize(Image ima

ge, int width, int height, int hints)

{

return image.getScaledInstan

ce(width, height, hints);

} // setSize

public Image setSi

ze(Image image, int width, i

nt height)

{

return setSize(image, width, //setSize调用的是上一个方法.

height, java.awt.Image.SCALE_DEFAULT);

} // setSize

//Component initialization

public static void main(String[] args)

{

ScreenPicSaver sps = new Scr

eenPicSaver();

// String sdir = new String("d:\");

// String sfile = new String

("desktop.bmp");

String outputFil

eName = new String("d:\desk

top.jpg");

//Image inputIma

ge = Toolkit.getDefaultToolk

it().getImage(inputFileName);

//Image inputIma

ge = sps.loadbitmap(sdir, sf

ile);

//==========================

=====================================

BufferedImage bufferedImage = null;

Robot robot;

Image inputImage = null;

try

{

robot = new Robot();

bufferedImage

= robot.createScreenCapture(

new Rectangle(Toolkit.

getDefaultToolkit().ge 对象

tScreenSize())); //得到桌面图像的bufferedImage

}

catch (Exception ex)

{

ex.printStackTrace();

}

int width = bufferedImage.getWidth();

int height = bufferedImage.g

etHeight();

inputImage = bufferedImage.g

etScaledInstance(width, height,

//将bufferedImage对象转化位Image对象

BufferedImage.TYPE_INT_RGB);

MediaTracker tracker = new M

ediaTracker(new Component()

{});

int outputWidth = inputImage 样

.getWidth(null); //使得新图像和原图像的宽度一

float outputQuality = 0.80f;

Image outputImag 度确定的情况下，高度在原

e = sps.setSize(inputImage, 图像的基础上成比例缩放

outputWidth, -1); //-1表示在宽

try

{

tracker.addImage(inputImage, 0);

//sps.tracker.waitForAll();

tracker.waitForID(0);

tracker.checkAll(true);

}

catch (InterruptedException e)

{

e.printStackTrace();

}

int imageWidth = inputImage.

getWidth(null);

if (imageWidth <　1)

{

throw new Ille

galArgumentException("image

width " + imageWidth +

" is out of range");

}

int imageHeight = inputImage

.getHeight(null);

if (imageHeight <　1)

{

throw new IllegalArgumentE

xception("image height " + imageHeight +

" is ou

t of range");

}

try

{

FileOutputStre

am fos = new FileOutputStrea

m(outputFileName);

sps.encodeJPEG(fos, output

Image, outputQuality);

fos.flush();

fos.close();

}

catch (Exception e)

{

e.printStackTrace();

}

System.exit(0);

}

}

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